Pre-heat the oven to 350 F.
In one bowl mix milk and oil.
Add egg and sugar and mix it well.
In another bowl sift together flour, baking powder, and green tea.
Add the dry ingredients to the wet ingredients and mix for about two minutes.
Add the 2 tablespoons of walnuts to the mix, keep a tablespoon to sprinkle on top.
Add 1/4 cup hot water and mix well.
Line a 12 cupcake sheet with liners.
Pour the mixture equally into all 12 cupcake cups.
Sprinkle the remaining walnuts on top.
Bake the cupcakes for about 10-11 minutes, or till the toothpick comes out clean. Simply take a toothpick and insert it into the center of the cupcake. If it comes out clean, or with only a few moist crumbs attached to it, the cake is done.